Ng-Change

<!DOCTYPE html>
<html lang="en-US">
<head>
 <title>Welcome in the Angular JS</title>
 <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.0-rc.1/angular.min.js"></script>
</head>
<body ng-app="sampleApplication">
  <div ng-controller="sampleController" >
    <input type="checkbox" ng-model="checked" ng-change="incrementCount()" /> 
    The value of checkbox change {{count}} times. 
  </div>
<script> 
  var app = angular.module("sampleApplication", []); 
  app.controller("sampleController", function($scope) { 
    $scope.count = 0; 
    $scope.incrementCount = function() { 
      $scope.count += 1; 
    }; 
  }); 
</script>
</body>
</html>
Output